there is such a letter that came after the purchase 10/28/2018
Instructions & Information
Your Download is Ready
Use the "Download" button to download Hypermarket Plus plugin. This link may be used up to 3 times before it expires.
To enable receiving automatic and one-click updates, locate the Hypermarket Plus plugin on plugins table page, then click Enter License Key and then enter your key (located above) into the text field.
If you do not receive a license key for your purchase within 24 hours, please contact us for support at email@example.com. Once we have verified the purchase information, we will deliver the license key to you manually.
In case you have entered the incorrect email address when making your purchase, we’d love to help you out. Just send us an email at firstname.lastname@example.org and we’ll be happy to help you solve this problem!
Once your license key is activated, whenever a new update is released you will be notified in WordPress Plugins page about it.
Transfer license key?
If you wish to transfer your license key to another domain name, be sure to revoke the registered key before deleting or uninstalling the plugin, or else you may need to purchase a new license key from mypreview.one online store.
Multisite or developers license?
Note that MyPreview, LLC does NOT offer multisite or developers license at the moment. In case you want to use Hypermarket Plus on several sites be sure to purchase one license per each site.
Get started here with a collection of tutorials that cover the basics.
If you have any question(s) about using Hypermarket Plus, please do not hesitate to check out our support forums and start a new discussion for further assistance or clarification.